O-ring Vs X-ring

I need to replace the chain on my Duc 600ss.  I have used D.I.D. kits in the past.  My riding buddies are in a heated discussion about X-ring Vs O-ring.  Use would be for spirited street riding and autobahn.
Thanks for the help.  
Broom Brooomm

D.I.D. chains are an excellent product.

While we haven't tested the actual "50% less friction" claims, the claims of retaining the lubrication and sealing out grime are reasonable because the "X" rings have more sealing edges than the single standard "O" ring.  

What is the differences in the x-ring and o-ring chains?  

The O-rings that seal in lubrication between the pins and plates on the chain have an "X" cross section (instead of standard "O" cross section), which allows them to have multiple sealing surfaces instead of one large one as with a standard O-ring. You can check out the diagrams here.  

Thanks for the info and the link,  explained alot.  

I seriously doubt if there is a valid "difference" in how long one style (like X ring) lasts over another style (like O ring).

X ring should have less pressure (resistance) drag, but not so sure it can be measured with any meaning.

There are gobs of factors in drag.  The Size of the riders Ass would be one, but when have you seen a rider do anything about the size of their Ass?

Or be obsessive to the half pound of air pressure in their tires, because of it's effect on drag?  (How tires work/feel is a different thing though).

Bottom Line...just get the highest grade, and in the Brand that has earned a reputation, and from a source you want to support...and ride that bike